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Terminal pair Function Expected resistance
3–4 RS-485/A and RS-485/B 40 kΩ to 50 kΩ
2–3 VDC– and RS-485/A 20 kΩ to 25 kΩ
2–4 VDC– and RS-485/B 20 kΩ to 25 kΩ
5. If any resistance measurements are lower than specified, the core processor may
not be able to communicate with a transmitter or a remote host. The meter may
need factory service.
Postrequisites
To return to normal operation:
1. Reconnect the 4-wire cable between the core processor and the transmitter.
2. Replace the core processor lid.
3. Restore power to the transmitter.
Note
When reassembling the meter components, be sure to grease all O-rings.
Troubleshooting
180 Micro Motion
®
Model 1500 Transmitters with Analog Outputs